Changes made by Council Directive of 17 October 1978 on the approximation of the laws of the Member States relating to the installation of lighting and light-signalling devices on wheeled agricultural and forestry tractors (78/933/EEC)
EU Directive 1978/933
No changes made by Council Directive of 17 October 1978 on the approximation of the laws of the Member States relating to the installation of lighting and light-signalling devices on wheeled agricultural and forestry tractors (78/933/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.